Eccentric drive



Nov. 1 1, 1930. I T. PlERSON 1,781,474

ECCENTRIC DRIVE Filed Feb. 18, 1929 IVNVENTQR v 70/m/aA/p ATTORNEY Patented Nov. 11, 1939 UNITED STATES PAT TORVALD N. PIERSON, or INDEPENDENCE, MISSOURI, ASSIGNOR 'ro THE GLEANER coMBINn nanvns'rnn CORPORATION, or INDEPE DE E, MIssoUn A CORPORA- TION or DELAWARE nocENTnIc nR'IvE Application filed February 18, 1329. Serial No. 340,973.

My invention relates to a power transmitting mechanlsm and more particularly to an eccentrlc drive for changing rotary motion to reciprocatorymotion, the principal bject of the invention being to provide an eccentric driveof simple, inexpensive construction and in which the wearing parts may be readily replaced.

In accomplishing this and other objects of the invention, I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein:

' F 1g. 1 1s a perspective view ofan,eccentrio and pitman embodying my invention.

Fig. 2 is a trio.

Fig. 3 is a vertical sectional view through the eccentric and pitman.

.Fig. 4; is a horizontal section on the line 4-4, Fig. 3.

Fig. 5 isa sectional view through the pitperspective view of the eccenman arm on the line 5-5, Fig. 1.

Referring in detail to the drawings: 1 designates a rotary drive shaft having a keyway 2 for receiving akey 3 for attachlng an eccentric member 4 to the shaft.

Themember 4 is preferably a unitary casting including a disk 5 anda journal 6 having its axis eccentric to the axis of the disk, the disk 5 beingprovided on its rear face with a hub 7 having a bore 8 continued through the disk and journal to receive the shaft, the bore 8 being provided with a keyway 9 complementary to the keyway in the shaftto receive the key 3 for securing the eccentric member to the shaft and the hub 7 i .with a reinforcing boss 11 opposite the keyway. The hub is preferably provided with an integral boss 12 which is drilled at an angle to the shaft and threaded'to receive y a set screw 13 for engaging against the shaft and supplementing the key.

The journal comprises a cylindrical boss cast integral with the disk and having peripheral flanges 14 and 15 to provide an annular seat 16 therebetween for receiving the pitman 17 now described. I

The pitman 17 includes an arm 18 of I-- shaped, cross-section as shown in Fig. 5 and the web 19 of the arm is provided with openings 20 to. lighten. the structure. ward end .21 of the arm is bored to receive! a shaft 22wl1ich is reciprocated by the pitman..-The'rear end 23 of the :pitman is -pro-. vided with an integral plate 24 having side flanges 25 and 26 providing a seat 27 for receivingabearing block 28. I i The blocks 28 are preferably constructed ofwood or other fibrous materialand formed inhalves 29and 30, each provided with a semi-circular seat 31 having a suitable diameter'to provide a working fit onthe journal when theyhalves are assembledithereon, and

ENT OFFICE The forincludes a body portion 37 having spaced flanges 39 and 10 complementary to the flanges on the pitman arm so that the bearing halves may be securely retained between the flanges and the bolts, the bolts being provided with nuts 41 for engaging against the keeper p ate.

In assembling a device constructed as described, the eccentric member is keyed to the shaft and the bearing halves assembled on the journal. The pitman arm 18 and the keeper plate 36 are then placed in position with the bearing between them, and the bolts 32 and 33 inserted through the plate on the pitman arm, F

through the grooves in the bearing, and through the keeper plate, after which the nuts are applied to the bolts and tightened against the keeper plate to complete the assembly.

That I claim and desire to secure by Letters Patent is: I

1. In a device of the character described, an eccentricmember including a journal, a pitman for the journal comprising an arm having a bearing receiving seat, a bearing for the arm comprising mated halves, grooves in opposite sides of the bearing, a keeper plate, and fastening devices extending through said keeper plate, bearing grooves, and pitman arm to retain the pitman on the journal.

2. In a device of the character described,

including an eccentric member having a journal, and a pitman for the journal comprising an arm havlng a bearlng receiving seat, a rectangular-shaped bearing for the arm includ ing matedhalves having grooves in their 0pposite sides,'a keeper plate, and fastening devices extending through said keeper plate,

' bearing grooves, and pitman arm to retain the pitmanonthe journal. V

3; In a'device of the characterdescribecl, a

pitman including an arm, a plate at the end,

of the arm having spaced flanges extending longitudinally thereof-toprovide a hearing 5 I seat therebetWeen, a rectangular bearing received in the'seathaving side grooves, a keep-f er plate complementary to the first named plate-for seating the opposite side of the hearing and bolts extending through the keeper plate, bearing grooves, and the plate on th armto retainthe bearing. 7 V -1 p 141. In a device of the character described,a pitman including an arm, aplate attire-end v of the arm-having spaced flanges extending v longitudinally thereof to provide a bearing seat, a hearing ,for the'pitman comprising mated halves, one, of Whichis received in said seat, a keeper-plate having spaced, longitudinal flanges to receive the other half ofthe" bearing, and fastening device's extending through the. keeper plate, hearing block, and

the plate on the arm toretain the'bearing. 1

In testimony whereof I aflix my signature; PIERSON. f 

